Silica rods are made of high purity quartz sand and crystal flour from local area or imported from Unimin of USA. The outer surface and inner quality of our products can meet international advanced standard. The surface is smooth and clear. The properties of the rods are: High purity(Domestic material SiO2>99.8%, Imported material SiO2>99.98%); Abrasion resistance(any acid except HF acid ); Fire resistance(softening point 1650 centigrade); Low coefficient of thermal expansion(5.5x10-7/centigrade), excellent electrical property.